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stira [4]
3 years ago
6

Please I need help in a rush

Mathematics
1 answer:
baherus [9]3 years ago
3 0

Answer:

i think the answer is 392= 49/Q

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A market research firm supplies manufacturers with estimates of the retail sales of their products from samples of retail stores
KengaRu [80]

Answer:

The 95% confidence interval for the difference of means is (7.67, 16.33).

The estimate is Md = 12.

The standard error is sM_d = 2.176.

Step-by-step explanation:

We have to calculate a 95% confidence interval for the difference between means.

The sample 1 (this year's sales), of size n1=36 has a mean of 53 and a standard deviation of 12.

The sample 2 (last year's sales), of size n2=49 has a mean of 41 and a standard deviation of 6.

The difference between sample means is Md=12.

M_d=M_1-M_2=53-41=12

The estimated standard error of the difference between means is computed using the formula:

s_{M_d}=\sqrt{\dfrac{\sigma_1^2}{n_1}+\dfrac{\sigma_2^2}{n_2}}=\sqrt{\dfrac{12^2}{36}+\dfrac{6^2}{49}}\\\\\\s_{M_d}=\sqrt{4+0.735}=\sqrt{4.735}=2.176

The degrees of freedom are:

df=n_1+n_2-1=36+49-2=83

The critical t-value for a 95% confidence interval and 83 degrees of fredom is t=1.989.

The margin of error (MOE) can be calculated as:

MOE=t \cdot s_{M_d}=1.989 \cdot 2.176=4.328

Then, the lower and upper bounds of the confidence interval are:

LL=M_d-t \cdot s_{M_d} = 12-4.328=7.67\\\\UL=M_d+t \cdot s_{M_d} = 12+4.328=16.33

The 95% confidence interval for the difference of means is (7.67, 16.33).

7 0
2 years ago
What is the solution to the inequality &gt; 20?<br><br> x 4<br> x 100
professor190 [17]

Answer:

100

Step-by-step explanation:

7 0
2 years ago
Find the value of each trigonometric ratio.<br><br> A. 15/17<br> B. 15/8<br> C. 17/8<br> D. 8/17
KonstantinChe [14]
B. 15/8 because you count all of it
3 0
2 years ago
I know how to do it I'm just lazy
alexandr402 [8]
Jason = 142 cm = 1.42 m
Amy = 137 cm = 1.37 m
Joseph = 1397 mm = 1.397 m

From shortest to tallest

I) Amy, Joseph, Jason
8 0
3 years ago
What number is four times as many as 25
Nana76 [90]

Answer:

100

Step-by-step explanation:

4 x 25 = 100

7 0
3 years ago
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